File and FileReader #512
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File and FileReader #512
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MartinsYong
suggested changes
Oct 30, 2019
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| Second, more often we get a file from `<input type="file">` or drag'n'drop or other browser interfaces. Then the file gets these from OS. | ||
| 其次，我们经常从 `<input type="file">` 或 拖拽 或 其他浏览器接口来获取。 然后，再从操作系统（OS) 中获取文件。 |
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| - `readAsDataURL(blob)` -- to base64 data url. | ||
| 因此我们可以用它将一个 blob 转换为其他格式: | ||
| - `readAsArrayBuffer(blob)` -- 转换为 `ArrayBuffer`, | ||
| - `readAsText(blob, [encoding])` -- 转换为字符串（替代 `TextDecoder`）, |
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[替代 TextDecoder] -> [TextDecoder 的一个替代]
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| ```smart header="`FileReaderSync` is available for workers only" | ||
| For Web Workers, there also exists a synchronous variant of `FileReader`, called [FileReaderSync](https://www.w3.org/TR/FileAPI/#FileReaderSync). | ||
| ```smart header="`FileReaderSync` 只适用于 workers " | ||
| 对于 Web Workers，还有一种同步的 `FileReader` 类型，称为 [FileReaderSync](https://www.w3.org/TR/FileAPI/#FileReaderSync)。 |
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| Its reading methods `read*` do not generate events, but rather return a result, as regular functions do. | ||
| FileReader 的读取方法 `read*` 并不生成事件，而是会和普通函数一样返回一个结果。 |
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| In addition to `Blob` methods and properties, `File` objects also have `fileName` and `lastModified` properties, plus the internal ability to read from filesystem. We usually get `File` objects from user input, like `<input>` or drag'n'drop. | ||
| 除了 `Blob` 方法和属性，`File` 对象还有 `fileName` 和 `lastModified` 属性，以及从文件系统读取的内部方法。 我们通常从用户输入如 `<input>` 或 拖拽（drag'n'drop）来获取 `File` 对象。 |
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| In many cases though, we don't have to read the file contents. Just as we did with blobs, we can create a short url with `URL.createObjectURL(file)` and assign it to `<a>` or `<img>`. This way the file can be downloaded or shown up as an image, as a part of canvas etc. | ||
| 但是，多数情况下，我们不必读取文件内容。正如我们处理 blobs 一样，我们可以通过 `URL.createObjectURL(file)` 创建一个短小的 url，并将其指定给 `<a>` 或 `<img>`。 这样，文件便可以下载或者呈现为图像，作为画布（canvas）等的一部分。 |
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Please make the requested changes. After it, add a comment "/done". |
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/done |
MartinsYong
approved these changes
Nov 1, 2019
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Thank you 💖 I updated the Progress Issue #324 🎉 🎉 🎉 |
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目标章节：4-binary/04-file/article
当前上游最新 commit：0cf94e8f3
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